/*  Copyright © 2009 Blake Hegerle -*- C++ -*- */

/*  This file is part of metal.
 
    Metal is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see
    <http://www.gnu.org/licenses/>.

*/

#pragma once

#include "forward.h"
#include "expression_conversion.h"
#include "meta/expr.h"

namespace metal {
  template<typename... Args>
  struct def_placeholder { 
    template<typename Expr>
    expression<
      meta::lambda_expr<
	void,
	typename expression_type_of<Expr>::meta_type, 
	Args...
      >
    >
    operator()(Expr e) {
      return expression_type_of<Expr>::impl(e);
    }
  };

  template<typename... Args>
  def_placeholder<Args...> def(Args... args) { 
    return def_placeholder<Args...>();
  } 

  template<typename Type, typename... Args>
  struct recdef_placeholder {
    template<typename Expr>
    expression<
      meta::lambda_expr<
	Type,
	typename expression_type_of<Expr>::meta_type, 
	Args...
      >
    >
    operator()(Expr e) {
      return expression_type_of<Expr>::impl(e);
    }
  };
  template<typename Type, typename... Args>
  recdef_placeholder<Type, Args...> recdef(Args... args) {
    return recdef_placeholder<Type, Args...>();
  }
}
